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WO2003101081A1 - Modem de donnees et de donnees vocales simultanees - Google Patents

Modem de donnees et de donnees vocales simultanees Download PDF

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Publication number
WO2003101081A1
WO2003101081A1 PCT/US2003/016711 US0316711W WO03101081A1 WO 2003101081 A1 WO2003101081 A1 WO 2003101081A1 US 0316711 W US0316711 W US 0316711W WO 03101081 A1 WO03101081 A1 WO 03101081A1
Authority
WO
WIPO (PCT)
Prior art keywords
voice
data
frequency
voice content
lull
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2003/016711
Other languages
English (en)
Inventor
Philip Ray Smith
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Airbiquity Inc
Original Assignee
Airbiquity Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Airbiquity Inc filed Critical Airbiquity Inc
Priority to AU2003234664A priority Critical patent/AU2003234664A1/en
Publication of WO2003101081A1 publication Critical patent/WO2003101081A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/403—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency
    • H04B1/406—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency with more than one transmission mode, e.g. analog and digital modes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
    • H04M11/064—Data transmission during pauses in telephone conversation

Definitions

  • the invention pertains to communications of voice and data over a single voice channel of a wireless communication network.
  • WAP or Wireless Application Protocol is a carrier-independent, transaction oriented protocol for wireless data networks. It is currently being implemented in various wireless devices to enable interactive sessions using "mini-web pages" or the like. One cannot simultaneously carry on a conversation over the same channel. Thus a WAP session is not a voice channel connection.
  • the present invention improves on prior art wireless communications by providing several new features and advantages. Briefly, it provides a communications system and method that employs lull detection to determine when voice content is not occupying the voice channel, and takes that opportunity to instead transmit data over the voice channel. In this way, data can be sent simultaneously without noticeably interfering with the voice conversation.
  • control signaling can be sent over the voice channel to provide control signals, whereas in prior art control signaling occurs via a separate control channel.
  • embedded signaling as described herein is transparent to the wireless service provider so that it cannot, for example, impose extra charges for transmission of data.
  • the present invention - comprising an SVD modem system - implements multiple modes of operation, and enables switching among various modes of operation "on the fly" responsive to current circumstances. These modes of operation can include: (1) data burst with reduced voice spectrum and automatic lull detection; (2) data burst with blanking of voice and automatic lull detection; and (3) continuous voice and data with spectrum sharing.
  • Fig. 1 is a frequency plot illustrating a reduced voice spectrum for use with simultaneous data transmission.
  • Fig. 2 is a frequency plot illustrating a full-spectrum voice channel.
  • Fig. 3 is a frequency plot illustrating a reduced voice spectrum and simultaneous control tone.
  • Fig. 4 is a frequency plot illustrating reduced voice spectrum together with a data band within the audio frequency range.
  • Fig. 5 is a frequency plot illustrating a reduced voice band, data band and signaling tone all within the audio frequency spectrum.
  • Fig. 6 is a simplified block diagram of one implementation of a modem for simultaneous transmission of voice and data over a single voice channel of a telecommunication system.
  • FIG. 6 it depicts the basic components of the SVD modem (the mobile cell unit and the base station, in the case of a cell phone application, will each have a SVD modem).
  • the mobile cell unit and the base station in the case of a cell phone application, will each have a SVD modem.
  • Transmitted Voice Low Pass (LP) filters (blocks 1 & 2) in figure 6: These filters act to band limit the voice signal before being mixed with other signals. Either the 3.1kHz or 1.8kHz filter is used depending on the needed configuration.
  • 400 Baud Modulation (Transmit) Band Pass filter (block 3): This filter band limits the outgoing 400 baud modem signal to between 2.1 and 3.1 kHz.
  • Received Voice Low Pass filters (block 4 & 5): This filter band limits the incoming voice signal to either 3.1 kHz or 1.8 kHz depending on the needed configuration.
  • 400 Baud Demodulation (Receive) Band Pass filter (block 6): This filter band limits the incoming 400 baud modem signal to between 2.1 and 3.1 kHz.
  • Automatic Lull Detector (block 7): This block detects when there is a lull in the conversation so data can be transmitted. This is used only in certain configurations. Lull detection is conveniently implemented in DSP software.
  • 400 Baud Modem (blocks 8 & 9): These blocks perform the function of modulation and demodulation of the 400 baud modem signal. Details of in-band signaling modems are shown in commonly-assigned U.S. Application No. 09/531,367 [attorney docket 4:7] incorporated herein by this reference.
  • Generate Control Tone (block 10): This block generates a 3.4 kHz tone that is mixed with the voice and modem signal that are transmitted. For certain configurations, this signal is used at the receiving end as an indication that a data packet is coming. This control tone is not heard by the user.
  • Detect Control Tone (block 11): This block detects a received 3.4 kHz control tone. It's used to notify the receiving system, for certain configurations, that it needs to reconfigure its self for the forthcoming data package. Simultaneous Voice and Data Modes
  • the voice and data can be continuously and independently transmitted.
  • the voice occupies one band and the data another as shown in Fig.1.
  • the voice is still clearly understood and sounds like a voice coming out of a home sound system with the treble turned up a bit.
  • the blocks need to be connected so the outgoing voice is always filtered by the 1.8 kHz Low Pass filter, the outgoing 400 baud signal (from the modulator) is always filtered by the 2.1/3.1 kHz Band Pass filter, the incoming voice is always filtered by a 1.8 kHz Low Pass filter, and the incoming 400 baud signal (that goes to the demodulator) is always filtered by a 2.1/3.1 kHz Band Pass filter.
  • the following blocks are not used: Automatic Lull Detect, Generate Control Tone, and Detect Control Tone.
  • the Automatic Lull Detection block monitors the voice signal for lulls.
  • a silent period of about 400 msec is considered a lull.
  • data from the 400 baud modulation block is transmitted.
  • the voice signal is connected to the 3.1 kHz LP filter resulting in a spectrum as shown in Fig. 2.
  • the voice signal is connected to the 1.8 kHz LP filter and mixed with the Control Tone and the filtered 400 baud modulated signal in the following way. For a brief time the reduced voice spectrum and control tone are present (figure 3) followed by a period when the voice (with reduced spectrum) and data are present (figure 4).
  • the system is always looking for the control tone.
  • the control tone When the control tone is detected, it knows that the voice will be reduced in spectrum and a data packet, occupying a band from 2.1 kHz to 3.1 kHz, will be forthcoming and reconfigures its self accordingly.
  • the receiving system filters the voice with a 1.8 kHz LP filter and the incoming modem signal with a 2.1/3.1 kHz BP filter.
  • the voice signal is then sent to the speaker/headset and the modem signal (data) is sent to 400 baud demodulator.
  • the Control Tone and data packets are handled in such a way that they are not heard.
  • Figure 5 is a frequency plot illustrating a reduced voice band, data band and signaling tone all within the audio frequency spectrum.
  • Another illustrative mode of operation is to send data as in the ' data burst with blanking and automatic lull detection ' mode except, instead of using the automatic lull detector and sending the packet during lulls, the data could be sent at fixed intervals (the 3.5 kHz control tone would still precede the data and the voice would still be blanked during the time data is sent).
  • the invention provides for multiple-mode operation with dynamic reconfiguration.
  • the data can be buffered.
  • the modem can also be configured to transmit a pending packet even if a lull in the voice input doesn't occur within a predetermined amount of time. This feature ensures that important data can be sent even if a lull does not occur within the selected time period. How often a lull occurs is entirely dependent upon the speaker. Some people naturally pause frequently while speaking, while others may talk almost continuously. We have found that in a typical conversation there will be lulls about 50% of the time. [0032] The timing on the lull detector is not critical within reasonable bounds.
  • a presently preferred packet size is relatively small, about 250 msec at most.
  • this translates to about 6 bytes net. More bytes could be sent in the same time frame if packet overhead were reduced.
  • the exact size of the packet preferably is configurable to accommodate various applications. For voice dominant applications, for example, the packet will be short. For data dominant applications they can be longer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Telephonic Communication Services (AREA)

Abstract

La présente invention concerne une émission simultanée de données et de données vocales via la voie à fréquence vocale d'un réseau de communications sans fil, tel qu'un réseau de téléphones cellulaires, cette émission étant reconfigurable à la volée parmi de multiples modes de fonctionnement, comprenant un mode de détection d'accalmie dans lequel des données dont transférées pendant une accalmie ou une période de calme du contenu vocal. En outre, on utilise une signalisation de commande dans la voie à fréquence vocale, plutôt qu'une voie de commande distincte ou de service pour prendre en charge le mode SVD. Ce système fonctionne de manière transparente sur n'importe quel système de télécommunications sans fil.
PCT/US2003/016711 2002-05-24 2003-05-27 Modem de donnees et de donnees vocales simultanees Ceased WO2003101081A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003234664A AU2003234664A1 (en) 2002-05-24 2003-05-27 Simultaneous voice and data modem

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US38344702P 2002-05-24 2002-05-24
US60/383,447 2002-05-24
US10/242,169 US7269188B2 (en) 2002-05-24 2002-09-11 Simultaneous voice and data modem
US10/242,169 2002-09-11

Publications (1)

Publication Number Publication Date
WO2003101081A1 true WO2003101081A1 (fr) 2003-12-04

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2003/016711 Ceased WO2003101081A1 (fr) 2002-05-24 2003-05-27 Modem de donnees et de donnees vocales simultanees

Country Status (3)

Country Link
US (2) US7269188B2 (fr)
AU (1) AU2003234664A1 (fr)
WO (1) WO2003101081A1 (fr)

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Also Published As

Publication number Publication date
AU2003234664A1 (en) 2003-12-12
US7269188B2 (en) 2007-09-11
US7411982B2 (en) 2008-08-12
US20030219068A1 (en) 2003-11-27
US20070268934A1 (en) 2007-11-22

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